Empty boxing is useful, also called shadow practice. As long as you concentrate, find a mirror, imagine yourself in the mirror as your enemy, and imagine the enemy's tricks. After that, you can fight back with corresponding tricks and dodge with footwork. Be careful not to use all your strength when you fight empty fists. When you play empty boxing, you should realize that attacking is also defending, and defending is also the truth of attacking. In fact, you can practice without sandbags. I'll give you a suggestion: skipping rope, push-ups, boxing push-ups, boxing push-ups every day. Of course, you have to work in groups. As for the number of each group, it depends on your physical condition. See how much you can accept at a time, but after each practice, you should increase the number until the next practice, even if you add one. Why did you add that to make you challenge your limits? Only by exceeding your own limit point will your limit point rise in the next practice. In fact, how much is not the goal. As long as you can go beyond your limits every time, your skills will naturally improve. Bruce Lee also improved himself by exceeding his own limits. It's the hardest time to practice. I can't hold on. When you want to give up, this time is your limit. As long as you exceed your limit, you will be promoted. No matter what others do, everyone is different from everyone. Maybe if you practice every day, you are not as good as a strong person who has never practiced. Remember, as long as you can go beyond your limits and beat yourself when exercising.